testng-562 testNG not creating HTML report
Fix NPE in XMLStringBuffer.java
Add corresponding Nullable annotations
It's old test, not worked for long time. Finally fixed
Make test for TESTNG-387 work
Merge pull request #571 from VladRassokhin/testng-387

Make test for TESTNG-387 work
Merge pull request #569 from VladRassokhin/fix-test-for-testng-106

It's old test, not worked for long time. Finally fixed
Merge pull request #568 from VladRassokhin/testng-562

Fix for #562
Use special thread names in GraphThreadPoolExecutor
Improve logging in GraphThreadPoolExecutor
Stop executor if cycle found in graph.
DynamicGraph: Do not add edge twice
Improve exception if cycle found in Graph#topologicalSort
Add test for #565
Fix Deadlock when using 'group-by-instance' and group dependencies
Improved 'group-by-instance' dependencies creation algorithm, now it consider existing dependency graph.